New! View global litigation for patent families

US6137402A - Method for arming a security system - Google Patents

Method for arming a security system Download PDF

Info

Publication number
US6137402A
US6137402A US09261984 US26198499A US6137402A US 6137402 A US6137402 A US 6137402A US 09261984 US09261984 US 09261984 US 26198499 A US26198499 A US 26198499A US 6137402 A US6137402 A US 6137402A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
status
receiver
system
faulted
security
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
US09261984
Inventor
Francis C. Marino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell International Inc
Original Assignee
Pittway Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Images

Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/008Alarm setting and unsetting, i.e. arming or disarming of the security system

Abstract

A method of arming a security system comprising one or more send-only RF sensor. The method comprises the steps of receiving a request to arm the system from a keypad, determining if a faulted status exists in the receiver/controller, if a faulted status does exist, then changing the faulted status to a restored status, and arming the security system when there are no faulted statuses in the receiver/controller.

Description

BACKGROUND OF THE INVENTION

This invention relates to wireless security systems that use send-only radio frequency (RF) sensors to indicate a fault condition in the monitored area, and in particular to wireless security systems that cannot be armed when the status signifies a fault condition. The fault condition may be detected motion, detected glass breakage, etc.

Many low cost wireless security systems use send-only RF sensor transmitters to communicate status to a receiver/control unit. The receiver/control unit monitors the status by receiving and decoding messages. When the security system is armed and a fault has been indicated in a message, the receiver/control unit initiates an alarm. For example, a motion detector transmits a fault message when motion has been detected and a restore message when the motion has ceased. Each message is generally transmitted a number of times to provide a high probability of receipt by the receiver/control unit.

Most sensor transmitters are rarely activated concurrently in typical wireless security systems, therefore the loss of a message is unusual. This may not be true for large security systems, such as those installed in a school building. In a site such as this, motion detectors are typically used to provide maximum coverage in areas that are difficult and more expensive to protect using door or window-type sensors. During the day, when the security system is not armed, many motion detectors are concurrently activated by people moving within the protected areas (i.e. changing of classes between class periods). This results in many concurrent message transmissions to the receiver/control unit, causing interference or clashing and possibly memory overflow. A loss of a restore message causes the controller to maintain a sensor faulted status. When the receiver/control unit detects a faulted status, it will not allow a user to arm the security system. In order to subsequently arm the security system, someone must re-activate the motion detector that has the faulted status associated with it. This causes a restore message to be transmitted without being interfered with by other transmitted messages, thereby causing the faulted status to be cleared. It may be possible that a number of motion detectors have failed to successfully deliver their restore messages. Each detector that has a fault status associated with it will need to be activated in order to arm the system.

It is therefore an object of the present invention to provide a method for arming a send-only RF security system regardless of lost restore messages due to clashing messages and/or RF receiver buffer storage limitations.

SUMMARY OF THE INVENTION

In accordance with these and other objects, the present invention is a method of arming a security system which comprises one or more of the following sensors: motion detectors, glass break detectors, shock sensors, wireless key fobs, and/or panic pendants. All of these sensors send fault messages when they detect a fault condition, and restore messages when the fault condition is cleared. In send-only RF security systems where there may be messages clashing or losses of messages due to memory overflow and where the receiver/controller does not have the capability to poll the sensor for its status, the receiver/controller may maintain a faulted status for one or more of the sensors because of associated lost restore messages. Since security systems can not be armed when there is a faulted status (because an alarm condition will occur immediately thereafter), the invalid faulted status maintained by the receiver/controller will keep the security system from being armed. The method of the present invention, which allows the security system to be armed in spite of a faulted status from a sensor, such as a motion detector, comprises the steps of receiving a request from a keypad to arm the system, determining if a faulted status for a sensor exists in the receiver/controller, if a faulted status does exist, then changing the faulted status to a restored status, and arming the security system when there are no faulted statuses in the receiver/controller. The steps of determining if a faulted status exists in the receiver/controller, and if a faulted status does exist, then changing the faulted status to a restored status may be repeated for any number of sensors until there is no faulted statuses in the receiver/controller. The changing of the faulted statuses to restored statuses is performed by simply changing a variable stored as a memory bit in the receiver/controller.

The present invention recognizes that some sensors, such as door detectors and window detectors, need to be physically examined when a fault condition is indicated. This is because one would-not want to leave the premises while these conditions exist. Therefore the receiver/controller has the ability to processes sensor fault conditions differently dependent on the sensor type, i.e. fault conditions from motion detectors may be disregarded, while fault conditions from door detectors may continue to keep the security system from being armed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of a security system of the preferred embodiment of the present invention.

FIG. 2 is a flow chart of the operation of the preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Shown in FIG. 1 are the components of a typical security system 2 comprising receiver/controller 22, keypad 20, window detector 4, door detector 6, motion detectors 8, glass breakage detector 10, shock sensor 12, key fob 14 and panic pendant 16. The sensors 4, 6, 8, 10, 12, 14, and 16 are send only sensors, transmitting RF messages to the receiver/controller 22. The receiver/controller 22 receives commands, such as arm or disarm, from the keypad 20. When the security system 2 is armed, the receiver/controller 22 processes the messages from the sensors 4, 6, 8, 10, 12, 14, and 16 and when a fault condition has been detected, i.e. glass breakage, the receiver/controller 22 transmits a signal to the siren 18. When the security system 2 is not armed, the sensors 4, 6, 8, 10, 12, 14, and 16 still transmit messages and the receiver/controller 22 still receives and processes the messages, but the siren 18 is not sounded. The messages sent by the sensors 4, 6, 8, 10, 12, 14, and 16 are transmitted a number of times to provide a high probability of the receiver/controller 22 receiving the messages. The sensors 4, 6, 8, 10, 12, 14, and 16 typically send supervision messages, fault messages and restore messages to the receiver/controller 22. The supervision messages provide sensor passive status information, the fault messages inform the receiver/controller 22 that motion (or glass breakage, or shock, etc.) has been detected in the area being monitored, and the restore messages inform the receiver/controller 22 that the motion (or glass breakage, or shock, etc.) has ceased. The operation of each of the components of the security system 2 is well known to someone skilled in the art and is not described further.

In the preferred embodiment of the present invention, the receiver/controller 22 processes the faulted status from the window detector 4 and the door detector 6 differently than from the motion detectors 8, glass breakage detector 10, the shock sensor 12, the key fob 14, and the panic pendant 16 to ensure that a window or a door is not left open while the system is armed.

The present invention addresses the problem of transmission clash or specifically loss of a restore message from a sensor 8, 10, 12, 14, or 16. This may occur when there are many sensors transmitting messages concurrently. The loss of a restore message causes the receiver/controller 22 to incorrectly maintain a faulted status for the sensor 8, 10, 12, 14, or 16. The loss of a restore message is not significant if the sensor 8, 10, 12, 14, or 16 is reactivated, causing a second restore message to be transmitted once the motion ceases and allowing the receiver/controller 22 to update the faulted status. The loss of the restore message may also occur if the memory located in the receiver/controller 22 overflows due to the volume of messages.

An example of a situation where the loss of the restore message could cause a problem is in a school building. The school building contains many motion detectors to monitor the entire site which includes hallways, stairways, and classrooms. During the school day the motion detectors are concurrently activated by many students changing classes at the same time. Concurrent activation also occurs when all of the students exit the building at the end of the school day. In a prior art security system installation, when a security guard attempted to arm the security system at the end of the day (when the building was empty), he was prevented from doing so because the receiver/controller 22 indicated a faulted condition from one or more of the motion detectors due to a loss of its associated restore message. The guard was then forced to reactivate the affected motion detector(s) causing it to transmit a restore message without concurrent sensor transmissions allowing the receiver/controller 22 to update the faulted condition. Once the erroneous faulted condition was deleted, the guard was finally able to arm the security system. In the present invention, the security system 2 may be armed regardless of missing restore messages from any number of sensors.

The flowchart of the preferred embodiment of the present invention is shown in FIG. 2. Once a message has been received and decoded, the receiver/controller 22 checks if the security system 2 is armed. If it has been, it checks if the message is a request to disarm and if so, it performs the disarm routine. If it is not, the receiver/controller 22 checks if the message is a fault message. If not, the receiver/controller 22 returns to the start of the routine. If it is a fault message, the receiver/controller 22 process the message as an alarm event and waits for a request to disarm. When a request for disarm is received the receiver/controller 22 logs the alarm event, disarms the security system 2, and goes back to the start of the routine. If the security system 2 is not armed, the receiver/controller 22 checks if the received message is an arm request. If it is not, the routine is started again. If it is a request for arm, the receiver/controller 22 checks if there are any fault conditions. If not, the security system 2 is armed and the routine is restarted.

In accordance with the present invention, if there is a fault condition, then the receiver/controller 22 checks if the fault condition has been caused by one of the sensors that it has been programmed to override (i.e. sensors 8, 10, 12, 14, or 16). If the fault condition is caused by one of the sensors that it has been programmed to override, then the faulted status is overridden (i.e cleared or updated) to a restored status. This may be done for any number of sensors 8, 10, 12, 14, and 16. The subsequent changing of the faulted status to a restored status is performed by changing a variable stored in memory for those sensors. Once the faulted status from the sensors 8, 10, 12, 14, and 16 are cleared, the receiver/controller 22 checks if there are any other fault conditions (i.e. smoke), and if there are the receiver/controller 22 performs the failure to arm routine and restarts. If there are no more faulted statuses, the system is armed and the routine is restarted.

If the faulted status was caused by a sensor that the receiver/controller 22 has not been programmed to override, then it will not clear the fault status to a restored status, but must wait for the particular sensor to transmit a restore message. This may occur in the case of a door sensor, where the user attempting to arm the system will have to investigate the area, and close the door to cause it to transmit a restore message and allow the system to be armed.

It will be apparent to those skilled in the art that modifications to the specific embodiment described herein may be made while still being within the spirit and scope of the present invention. For example, the present invention is disclosed for a send-only RF security system, but may also be used in other types of security systems. Also the security system may include other components such as a wireless keypad or a dialer. Although the intent of the present invention is to ignore incorrect faulted statuses from the motion detectors 8, glass breakage detector 10, the shock sensor 12, the key fob 14, and the panic pendant 16, the present invention may also be used to ignore faulted statuses from the window detector 4 and the door detector 6. Lastly, the flow of operations may be performed differently.

Claims (16)

I claim:
1. In a security system comprising one or more sensors, said sensors transmitting RF signals, said RF signals including fault messages and restore messages, and an RF receiver/controller for receiving and processing said fault and restore messages to provide a faulted status or a restored status for each sensor; a method of arming said security system comprising the steps of:
a) receiving a request from a user to arm the system,
b) determining if a faulted status exists in the receiver/controller, at the time the receiver/controller received the request to arm the system,
c) if a faulted status exists at the time the receiver/controller received the request to arm the system, then automatically changing said faulted status to a restored status without requiring the detection of a restore message from a sensor, and
d) arming said security system when there are no faulted statuses in the receiver/controller.
2. The method of claim 1 further comprising the repeating of steps b and c until there is no faulted statuses in the receiver/controller.
3. The method of claim 1 wherein said sensor is a motion detector.
4. The method of claim 1 wherein said sensor is a glass break detector.
5. The method of claim 1 wherein said sensor is a shock sensor.
6. The method of claim 1 wherein said sensor is a wireless key fob.
7. The method of claim 1 wherein said sensor is a panic pendant.
8. The method of claim 1 wherein the step of automatically changing said faulted status to a restored status without requiring the detection of a restore message from a sensor is only carried out if the faulted status is associated with a motion detector.
9. A security system comprising:
a) a sensor device comprising:
i) sensor means for detecting a fault condition in an area of interest, and
ii) means for transmitting an RF signal from said sensor means in response to detecting said fault condition, said RF signal containing a fault message upon fault condition detection, and said RF signal containing a restore message upon detection of cessation of said fault condition, and
b) a receiver/controller comprising:
i) means for receiving said RF signal,
ii) means for processing said RF signal to provide a faulted status in response to a fault message and a restored status in response to a restore message,
iii) means for receiving a request from a user to arm the security system,
iv) means for determining if a faulted status exists,
v) means for automatically changing said faulted status to a restored status when said faulted status exists at the time a request to arm is received, and
vi) means for arming said security system when there is no faulted status.
10. The security system of claim 9 further comprising a plurality of sensor devices.
11. The security system of claim 9 wherein said sensor device is a motion detector.
12. The security system of claim 9 wherein said sensor device is a glass break detector.
13. The security system of claim 9 wherein said sensor device is a shock sensor.
14. The security system of claim 9 wherein said sensor device is a wireless key fob.
15. The security system of claim 9 wherein said sensor device is a panic pendant.
16. The security system of claim 9 further comprising means for determining if an existing faulted status is associated with a motion detector and wherein said means for automatically changing said faulted status to a restore status only changes said faulted status to a restore status when said faulted status is determined to be from a motion detector.
US09261984 1999-03-04 1999-03-04 Method for arming a security system Active US6137402A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US09261984 US6137402A (en) 1999-03-04 1999-03-04 Method for arming a security system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09261984 US6137402A (en) 1999-03-04 1999-03-04 Method for arming a security system

Publications (1)

Publication Number Publication Date
US6137402A true US6137402A (en) 2000-10-24

Family

ID=22995696

Family Applications (1)

Application Number Title Priority Date Filing Date
US09261984 Active US6137402A (en) 1999-03-04 1999-03-04 Method for arming a security system

Country Status (1)

Country Link
US (1) US6137402A (en)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030067385A1 (en) * 2001-09-10 2003-04-10 Eric Shank Motion sensor device
US20040150521A1 (en) * 2003-02-03 2004-08-05 Stilp Louis A. RFID based security system
US20040160324A1 (en) * 2003-02-03 2004-08-19 Stilp Louis A. Controller for a security system
US20040196153A1 (en) * 2003-04-07 2004-10-07 Cockburn John Malcolm Continuous feedback container security system
US20040215750A1 (en) * 2003-04-28 2004-10-28 Stilp Louis A. Configuration program for a security system
US20040212500A1 (en) * 2003-02-03 2004-10-28 Stilp Louis A. RFID based security network
US20040212494A1 (en) * 2003-02-03 2004-10-28 Stilp Louis A. Cordless telephone system
US20040212493A1 (en) * 2003-02-03 2004-10-28 Stilp Louis A. RFID reader for a security network
US20050110635A1 (en) * 2003-03-20 2005-05-26 Giermanski James R. System, methods and computer program products for monitoring transport containers
US7057512B2 (en) 2003-02-03 2006-06-06 Ingrid, Inc. RFID reader for a security system
US7079034B2 (en) 2003-02-03 2006-07-18 Ingrid, Inc. RFID transponder for a security system
US7079020B2 (en) 2003-02-03 2006-07-18 Ingrid, Inc. Multi-controller security network
US7091827B2 (en) 2003-02-03 2006-08-15 Ingrid, Inc. Communications control in a security system
US7119658B2 (en) 2003-02-03 2006-10-10 Ingrid, Inc. Device enrollment in a security system
US20070063841A1 (en) * 2005-09-22 2007-03-22 Honeywell International, Inc. Cross-zone supervision for a security system
US7283048B2 (en) 2003-02-03 2007-10-16 Ingrid, Inc. Multi-level meshed security network
US7495544B2 (en) 2003-02-03 2009-02-24 Ingrid, Inc. Component diversity in a RFID security network
US20090066652A1 (en) * 2007-09-10 2009-03-12 Verstraelen J G R Keypad for a security system
US7511614B2 (en) 2003-02-03 2009-03-31 Ingrid, Inc. Portable telephone in a security network
US7532114B2 (en) 2003-02-03 2009-05-12 Ingrid, Inc. Fixed part-portable part communications network for a security network
US8665084B2 (en) 2011-07-29 2014-03-04 Adt Us Holdings, Inc. Security system and method
US9520049B2 (en) 2014-12-30 2016-12-13 Google Inc. Learned overrides for home security

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839711A (en) * 1970-04-02 1974-10-01 Minnesota Mining & Mfg Security system and control circuit
US4179691A (en) * 1976-11-15 1979-12-18 Cerberus Ag Infrared intrusion detector circuit
US4232308A (en) * 1979-06-21 1980-11-04 The Scott & Fetzer Company Wireless alarm system
US4517554A (en) * 1981-05-26 1985-05-14 Siemens Aktiengesellschaft Method and apparatus for inspecting a danger alarm system
US5677664A (en) * 1995-10-10 1997-10-14 Jon Snyder, Inc. Controlling automobile alarm systems
US5977871A (en) * 1997-02-13 1999-11-02 Avr Group Limited Alarm reporting system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3839711A (en) * 1970-04-02 1974-10-01 Minnesota Mining & Mfg Security system and control circuit
US4179691A (en) * 1976-11-15 1979-12-18 Cerberus Ag Infrared intrusion detector circuit
US4232308A (en) * 1979-06-21 1980-11-04 The Scott & Fetzer Company Wireless alarm system
US4517554A (en) * 1981-05-26 1985-05-14 Siemens Aktiengesellschaft Method and apparatus for inspecting a danger alarm system
US5677664A (en) * 1995-10-10 1997-10-14 Jon Snyder, Inc. Controlling automobile alarm systems
US5977871A (en) * 1997-02-13 1999-11-02 Avr Group Limited Alarm reporting system

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030067385A1 (en) * 2001-09-10 2003-04-10 Eric Shank Motion sensor device
US7019639B2 (en) 2003-02-03 2006-03-28 Ingrid, Inc. RFID based security network
US20040160324A1 (en) * 2003-02-03 2004-08-19 Stilp Louis A. Controller for a security system
US7532114B2 (en) 2003-02-03 2009-05-12 Ingrid, Inc. Fixed part-portable part communications network for a security network
US7511614B2 (en) 2003-02-03 2009-03-31 Ingrid, Inc. Portable telephone in a security network
US20040212500A1 (en) * 2003-02-03 2004-10-28 Stilp Louis A. RFID based security network
US20040212494A1 (en) * 2003-02-03 2004-10-28 Stilp Louis A. Cordless telephone system
US20040212493A1 (en) * 2003-02-03 2004-10-28 Stilp Louis A. RFID reader for a security network
US7495544B2 (en) 2003-02-03 2009-02-24 Ingrid, Inc. Component diversity in a RFID security network
US7283048B2 (en) 2003-02-03 2007-10-16 Ingrid, Inc. Multi-level meshed security network
US20040150521A1 (en) * 2003-02-03 2004-08-05 Stilp Louis A. RFID based security system
US7023341B2 (en) 2003-02-03 2006-04-04 Ingrid, Inc. RFID reader for a security network
US7042353B2 (en) 2003-02-03 2006-05-09 Ingrid, Inc. Cordless telephone system
US7053764B2 (en) 2003-02-03 2006-05-30 Ingrid, Inc. Controller for a security system
US7057512B2 (en) 2003-02-03 2006-06-06 Ingrid, Inc. RFID reader for a security system
US7079034B2 (en) 2003-02-03 2006-07-18 Ingrid, Inc. RFID transponder for a security system
US7079020B2 (en) 2003-02-03 2006-07-18 Ingrid, Inc. Multi-controller security network
US7084756B2 (en) 2003-02-03 2006-08-01 Ingrid, Inc. Communications architecture for a security network
US7091827B2 (en) 2003-02-03 2006-08-15 Ingrid, Inc. Communications control in a security system
US7202789B1 (en) 2003-02-03 2007-04-10 Ingrid, Inc. Clip for RFID transponder of a security network
US7119658B2 (en) 2003-02-03 2006-10-10 Ingrid, Inc. Device enrollment in a security system
US7154390B2 (en) * 2003-03-20 2006-12-26 Powers International, Inc. System, methods and computer program products for monitoring transport containers
US20050110635A1 (en) * 2003-03-20 2005-05-26 Giermanski James R. System, methods and computer program products for monitoring transport containers
US6870476B2 (en) 2003-04-07 2005-03-22 Bulldog Technologies Inc. Continuous feedback container security system
US20040196153A1 (en) * 2003-04-07 2004-10-07 Cockburn John Malcolm Continuous feedback container security system
US20040215750A1 (en) * 2003-04-28 2004-10-28 Stilp Louis A. Configuration program for a security system
WO2007038224A3 (en) * 2005-09-22 2007-07-12 Honeywell Int Inc Cross-zone supervision for a security system
US7423530B2 (en) * 2005-09-22 2008-09-09 Honeywell International Inc. Cross-zone supervision for a security system
WO2007038224A2 (en) * 2005-09-22 2007-04-05 Honeywell International, Inc. Cross-zone supervision for a security system
US20070063841A1 (en) * 2005-09-22 2007-03-22 Honeywell International, Inc. Cross-zone supervision for a security system
US20090066652A1 (en) * 2007-09-10 2009-03-12 Verstraelen J G R Keypad for a security system
US8059095B2 (en) * 2007-09-10 2011-11-15 Utc Fire & Security Americas Corporation, Inc. Keypad for a security system
US8665084B2 (en) 2011-07-29 2014-03-04 Adt Us Holdings, Inc. Security system and method
US9117349B2 (en) 2011-07-29 2015-08-25 Adt Us Holdings, Inc. Security system having segregated operating software
US9286772B2 (en) 2011-07-29 2016-03-15 Adt Us Holdings, Inc. Security system and method
US9589441B2 (en) 2011-07-29 2017-03-07 Adt Us Holdings, Inc. Security system and method
US9520049B2 (en) 2014-12-30 2016-12-13 Google Inc. Learned overrides for home security
US9916751B2 (en) 2014-12-30 2018-03-13 Google Llc Learned overrides for home security

Similar Documents

Publication Publication Date Title
US8504103B2 (en) Cellular home security system
US6255944B1 (en) Remote indication device for use in wireless security systems
US6999562B2 (en) Security control and communication system and method
US5874889A (en) System and methods for triggering and transmitting vehicle alarms to a central monitoring station
US5568535A (en) Alarm system for enclosed area
US4367458A (en) Supervised wireless security system
US4812820A (en) Electronic surveillance system and transceiver unit therefor
US7218217B2 (en) False alarm reduction in security systems using weather sensor and control panel logic
US6963280B2 (en) Door security device for use in security systems
US6472993B1 (en) Singular housing window or door intrusion detector using earth magnetic field sensor
US5309144A (en) Proximity sensing security system
US20030058096A1 (en) Notification of use of network-enabled device
US5999799A (en) Auto-finder and distance warning method and apparatus for a remote control input device
US20050128068A1 (en) Home security system with vehicle interface, and remote vehicle monitor
US5155469A (en) Wireless alarm system
US5216410A (en) Intrusion alarm sensing unit
US6351829B1 (en) System and method for distinguishing a device failure from an inter-device communication failure
US20110309929A1 (en) Security system with keyfob alert notification
US5499196A (en) Sensor interface for computer-based notification system
US5831526A (en) Atmospheric hazard detector network
US6970081B1 (en) Distributed software controlled theft detection
US6252501B1 (en) Message repeating apparatus and method
US5717378A (en) Security system with fall back to local control
US20120154126A1 (en) Bidirectional security sensor communication for a premises security system
US5166664A (en) Warning method and apparatus and parallel correlator particularly useful therein

Legal Events

Date Code Title Description
AS Assignment

Owner name: PITTWAY CORPORATION, ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MARINO, FRANCIS C.;REEL/FRAME:009806/0776

Effective date: 19990303

CC Certificate of correction
AS Assignment

Owner name: HONEYWELL INTERNATIONAL INC., NEW JERSEY

Free format text: MERGER;ASSIGNOR:PITTWAY CORPORATION;REEL/FRAME:014223/0953

Effective date: 20030327

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12